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Four green 288-pin DDR4 LRDIMM modules with black chips

OWC

OWC 512GB (4x128GB) DDR4 2666MHz CL19 4Rx4 ECC LRDIMM 1.2V 288-pin server RAM

SKU CH-9FBR-PSAWK

512 GB DDR4 2666 MHz ECC load-reduced quad-rank server kit with 1.2 V operation and 2133 / 2400 MHz backward compatibility

  • Capacity512GB (4 x 128GB)
  • Type288-Pin DDR4 ECC LRDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 512GB (4 x 128GB)

  • ECC load-reduced design protects data integrity in servers
  • 512 GB total capacity across four 128 GB modules
  • DDR4 2666 MHz CL19 at 1.2 V for efficient throughput
  • Backward compatible with 2133 MHz and 2400 MHz systems
  • JEDEC and RoHS compliant for warranty-safe upgrades

512 GB DDR4 LRDIMM kit for servers

This kit supplies 512 GB of DDR4 2666 MHz ECC load-reduced memory across four 128 GB modules. It targets administrators upgrading workstations, servers or NAS systems that require registered LRDIMM architecture. The modules operate at 1.2 V with a CL19 latency and conform to the PC4-21300 standard. They are not suitable for standard desktop platforms.

Compatibility checklist before ordering

Verify that your platform accepts 288-pin DDR4 LRDIMM modules with 4Rx4 organisation and ECC load-reduced buffering. The system must support DDR4 2666, 2400 or 2133 MHz speeds and 1.2 V operation. Do not mix these modules with unbuffered or standard registered DIMMs. Confirm the motherboard or server manual lists LRDIMM support and the required population rules for quad-rank parts.

Upgrading from lower-capacity DDR4 LRDIMMs

The jump makes sense when current memory limits virtual-machine density, database caching or large-dataset processing. Replacing smaller LRDIMMs with these 128 GB modules maximises slot utilisation on boards with limited DIMM sockets. The upgrade is worth it when the workload demands the full 512 GB kit and the platform qualifies the 4Rx4 load-reduced design.

Highlights

  • ECC load-reduced design protects data integrity in servers
  • 512 GB total capacity across four 128 GB modules
  • DDR4 2666 MHz CL19 at 1.2 V for efficient throughput
  • Backward compatible with 2133 MHz and 2400 MHz systems
  • JEDEC and RoHS compliant for warranty-safe upgrades

Specifications

BrandOWC
Part Number2L6D44R4512S
Capacity512GB (4 x 128GB)
Type288-Pin DDR4 ECC LRDIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredLoad Reduced
Rank4Rx4
Multi-channel KitDual Channel Kit
Heat SpreaderNo

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Questions about this item

What does the 512GB kit contain and is anything else required to install it?

The kit includes four 128GB DDR4 2666MHz CL19 4Rx4 ECC LRDIMM modules. No extra parts are needed for installation in a compatible server or workstation.

Why choose the 512GB (4x128GB) version over a smaller capacity?

This 512GB kit provides maximum density with four 128GB LRDIMMs, ideal for virtualization or large datasets where a lower total capacity would limit workloads.

What does the 2666MHz speed mean once the memory is running in a server?

The modules run at 2666MHz (PC4-21300) with CL19 latency and will also operate at 2400MHz or 2133MHz if the platform requires a lower speed.

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